cryptolocker | c6a557f58591a6cb419bf81687d42c922fcc4dd870873d8692c78e88c71caaec

Resubmissions

08-02-2024 19:01

240208-xpql5sbb94 10

07-02-2024 09:01

240207-ky1r9afcd2 10

Analysis

max time kernel
600s
max time network
604s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
08-02-2024 19:01

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General

Target

2024-02-07_e89be3c49a4a6b1bdfd5a75f4ba47ceb_cryptolocker.exe
Size

370KB
MD5

e89be3c49a4a6b1bdfd5a75f4ba47ceb
SHA1

e903d24265e56113706bfde379a6f2a6acb1851e
SHA256

c6a557f58591a6cb419bf81687d42c922fcc4dd870873d8692c78e88c71caaec
SHA512

34a2049345596e810b5a72e8141a7ec233f95d7639c09beab8d21c06cef5a1b6490491e447e3564cbefce05cd5d58807e898985a49819ad49e84d1e056163d0b
SSDEEP

6144:lHrjZhghBCLlsBxFJWCDA/tHHTdrXvdWgTO3x5N22vWvLRKKAX5l++SyVISD:BZhghBCMxFJWCE/tHz9/FT85I2vCMX5V

Score

10^/10

cryptolocker persistence ransomware

Malware Config

Signatures

CryptoLocker
Ransomware family with multiple variants.
ransomware cryptolocker
Deletes itself 1 IoCs

Processes:

Avywuixyxmexxtr.exe

pid process

1212 Avywuixyxmexxtr.exe
Executes dropped EXE 2 IoCs

Processes:

Avywuixyxmexxtr.exeAvywuixyxmexxtr.exe

pid process

1212 Avywuixyxmexxtr.exe
2712 Avywuixyxmexxtr.exe
Loads dropped DLL 2 IoCs

Processes:

2024-02-07_e89be3c49a4a6b1bdfd5a75f4ba47ceb_cryptolocker.exeAvywuixyxmexxtr.exe

pid process

1028 2024-02-07_e89be3c49a4a6b1bdfd5a75f4ba47ceb_cryptolocker.exe
1212 Avywuixyxmexxtr.exe

pid	process
1212	Avywuixyxmexxtr.exe

pid	process
1212	Avywuixyxmexxtr.exe
2712	Avywuixyxmexxtr.exe

pid	process
1028	2024-02-07_e89be3c49a4a6b1bdfd5a75f4ba47ceb_cryptolocker.exe
1212	Avywuixyxmexxtr.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

Avywuixyxmexxtr.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-3427588347-1492276948-3422228430-1000\Software\Microsoft\Windows\CurrentVersion\Run\CryptoLocker = "C:\\Users\\Admin\\AppData\\Local\\Avywuixyxmexxtr.exe"	Avywuixyxmexxtr.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3427588347-1492276948-3422228430-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\*CryptoLocker = "C:\\Users\\Admin\\AppData\\Local\\Avywuixyxmexxtr.exe"	Avywuixyxmexxtr.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

2024-02-07_e89be3c49a4a6b1bdfd5a75f4ba47ceb_cryptolocker.exeAvywuixyxmexxtr.exe

description	pid	process	target process
PID 1028 wrote to memory of 1212	1028	2024-02-07_e89be3c49a4a6b1bdfd5a75f4ba47ceb_cryptolocker.exe	Avywuixyxmexxtr.exe
PID 1028 wrote to memory of 1212	1028	2024-02-07_e89be3c49a4a6b1bdfd5a75f4ba47ceb_cryptolocker.exe	Avywuixyxmexxtr.exe
PID 1028 wrote to memory of 1212	1028	2024-02-07_e89be3c49a4a6b1bdfd5a75f4ba47ceb_cryptolocker.exe	Avywuixyxmexxtr.exe
PID 1028 wrote to memory of 1212	1028	2024-02-07_e89be3c49a4a6b1bdfd5a75f4ba47ceb_cryptolocker.exe	Avywuixyxmexxtr.exe
PID 1212 wrote to memory of 2712	1212	Avywuixyxmexxtr.exe	Avywuixyxmexxtr.exe
PID 1212 wrote to memory of 2712	1212	Avywuixyxmexxtr.exe	Avywuixyxmexxtr.exe
PID 1212 wrote to memory of 2712	1212	Avywuixyxmexxtr.exe	Avywuixyxmexxtr.exe
PID 1212 wrote to memory of 2712	1212	Avywuixyxmexxtr.exe	Avywuixyxmexxtr.exe

C:\Users\Admin\AppData\Local\Temp\2024-02-07_e89be3c49a4a6b1bdfd5a75f4ba47ceb_cryptolocker.exe
"C:\Users\Admin\AppData\Local\Temp\2024-02-07_e89be3c49a4a6b1bdfd5a75f4ba47ceb_cryptolocker.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1028
- C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe
  "C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe" "-rC:\Users\Admin\AppData\Local\Temp\2024-02-07_e89be3c49a4a6b1bdfd5a75f4ba47ceb_cryptolocker.exe"
  2⤵
  - Deletes itself
  - Executes dropped EXE
  - Loads dropped DLL
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:1212
- - C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe
    "C:\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe" -w11c
    3⤵
    - Executes dropped EXE
    PID:2712

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Avywuixyxmexxtr.exe

Filesize
370KB

MD5
e89be3c49a4a6b1bdfd5a75f4ba47ceb

SHA1
e903d24265e56113706bfde379a6f2a6acb1851e

SHA256
c6a557f58591a6cb419bf81687d42c922fcc4dd870873d8692c78e88c71caaec

SHA512
34a2049345596e810b5a72e8141a7ec233f95d7639c09beab8d21c06cef5a1b6490491e447e3564cbefce05cd5d58807e898985a49819ad49e84d1e056163d0b

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